Medical School · Year 3 · General Surgery · includes a quiz and discussion video

Seminar 08: Esophageal Disease

Year 3: General Surgery Clerkship

Learning Objectives

By the end of this seminar, students will be able to:

1. Describe esophageal anatomy and physiology
2. Evaluate and manage gastroesophageal reflux disease
3. Recognize Barrett's esophagus and its management
4. Diagnose and stage esophageal cancer
5. Describe surgical treatment for esophageal disorders
6. Manage esophageal emergencies

I. Esophageal Anatomy

The esophagus is a muscular tube approximately 25 to 30 centimeters in length extending from the hypopharynx at the level of the cricoid cartilage (C6) to the gastroesophageal junction, traversing the neck, thorax, and briefly the abdomen. The cervical esophagus extends from the cricopharyngeus to the thoracic inlet, measuring approximately 5 centimeters. The thoracic esophagus is the longest segment at approximately 20 centimeters, coursing through the posterior mediastinum. The abdominal esophagus is a short 2 to 3 centimeter segment below the diaphragm, with this intra-abdominal length contributing to the anti-reflux mechanism.

The esophagus has three areas of anatomic narrowing that have clinical significance for foreign body impaction, stricture formation, and perforation risk. The cricopharyngeus muscle at the upper esophageal sphincter creates the first narrowing at approximately 15 centimeters from the incisors. The second narrowing occurs where the aortic arch and left main bronchus cross the esophagus at approximately 25 centimeters from the incisors. The third narrowing is at the diaphragmatic hiatus at approximately 40 centimeters from the incisors, where the esophagus passes through the crural fibers.

The blood supply to the esophagus is segmental and lacks extensive anastomotic networks, making it vulnerable to ischemia and explaining the relatively high anastomotic leak rates following esophagectomy. The cervical esophagus receives blood from the inferior thyroid artery, while the thoracic esophagus is supplied by bronchial arteries and direct branches from the thoracic aorta. The abdominal esophagus is supplied by branches from the left gastric and inferior phrenic arteries. Venous drainage follows a similar segmental pattern and includes the important submucosal portosystemic anastomoses that become clinically significant as esophageal varices in portal hypertension.

A crucial anatomic consideration is that the esophagus lacks a serosa, instead covered only by loose adventitial connective tissue. This absence of serosa allows more rapid spread of esophageal cancer into surrounding structures and contributes to the relatively high anastomotic leak rates following esophageal surgery, as there is no serosal layer to provide additional strength to anastomotic healing. The wall consists of mucosa (stratified squamous epithelium in the proximal esophagus, transitioning to columnar at the gastroesophageal junction), submucosa, and muscularis propria (inner circular and outer longitudinal layers), with the upper third containing striated muscle transitioning to smooth muscle in the lower two-thirds.

<image>Panel A: Longitudinal diagram of the esophagus showing cervical, thoracic, and abdominal segments with corresponding lengths and landmarks. Panel B: Cross-sectional view demonstrating the four histologic layers and absence of serosa. Panel C: Anatomic narrowings at cricopharyngeus, aortic arch/left bronchus, and diaphragmatic hiatus with distances from incisors. Panel D: Arterial blood supply showing segmental vessels from inferior thyroid, aortic branches, and left gastric arteries.</image>

II. Esophageal Physiology

Swallowing is a complex coordinated process involving three phases that transition from voluntary to involuntary control. The oral phase is voluntary and involves preparing the food bolus and propelling it posteriorly with the tongue toward the oropharynx. The pharyngeal phase is involuntary and begins when the bolus reaches the posterior pharynx, triggering a reflex sequence including soft palate elevation, laryngeal closure, and upper esophageal sphincter relaxation. The esophageal phase involves primary peristalsis initiated by swallowing, with sequential contraction propelling the bolus toward the stomach at approximately 3 to 4 centimeters per second, with the entire transit taking 8 to 10 seconds.

The lower esophageal sphincter is a 3 to 4 centimeter zone of tonically contracted smooth muscle that prevents reflux of gastric contents into the esophagus while relaxing to allow passage of the food bolus. The resting pressure of the LES is typically 15 to 25 mmHg above gastric pressure, maintained by intrinsic myogenic tone and augmented by the external compression of the crural diaphragm. Factors that increase LES pressure include gastrin, protein meals, and cholinergic stimulation, while factors that decrease pressure include dietary factors such as fat, chocolate, caffeine, and alcohol, as well as hormones including secretin, cholecystokinin, and progesterone.

The anti-reflux barrier is a complex functional unit incorporating multiple anatomic and physiologic components. The intrinsic LES provides the primary barrier, while the crural diaphragm serves as an external sphincter, augmenting pressure during inspiration and periods of increased intra-abdominal pressure. The acute angle of His, formed by the junction of the esophagus and gastric fundus, creates a flap-valve mechanism. The phrenoesophageal ligament anchors the esophagus to the diaphragmatic hiatus, and the intra-abdominal segment of esophagus is exposed to positive abdominal pressure, helping to compress the LES during periods of increased gastric pressure.

Esophageal motility involves several patterns of contraction that maintain normal bolus transport and clearance. Primary peristalsis is initiated by swallowing and consists of a sequential wave of contraction preceded by a wave of relaxation that propels the bolus aborally. Secondary peristalsis is triggered by esophageal distension from residual material and serves to clear refluxed gastric contents or retained food. Tertiary contractions are non-peristaltic, simultaneous contractions that are abnormal when frequent and may be associated with chest pain or dysphagia. The enteric nervous system, particularly the myenteric plexus of Auerbach, coordinates these motor patterns through inhibitory (nitric oxide) and excitatory (acetylcholine) neurotransmitters.

<image>Panel A: Three phases of swallowing showing oral, pharyngeal, and esophageal phases with corresponding anatomic movements. Panel B: Lower esophageal sphincter pressure tracing demonstrating normal resting tone and relaxation with swallowing. Panel C: Components of the anti-reflux barrier including LES, crural diaphragm, angle of His, and intra-abdominal esophagus. Panel D: Manometric tracings comparing normal primary peristalsis with abnormal tertiary contractions.</image>

III. Gastroesophageal Reflux Disease

Gastroesophageal reflux disease results from the failure of normal anti-reflux mechanisms, allowing gastric contents to reflux into the esophagus and cause symptoms or mucosal injury. The most common underlying mechanism is transient lower esophageal sphincter relaxations, which are vagally mediated relaxations unrelated to swallowing that occur more frequently in GERD patients. Hypotensive LES, defined as resting pressure below 10 mmHg, directly allows reflux, while hiatal hernia disrupts the anatomic components of the anti-reflux barrier by displacing the LES above the crural diaphragm. Impaired esophageal clearance from dysmotility prolongs acid contact time, and delayed gastric emptying increases the volume available for reflux.

The clinical presentation of GERD encompasses both typical and atypical symptoms. Typical symptoms include heartburn, described as a burning sensation in the retrosternal area that may radiate to the throat, and regurgitation of sour or bitter material. Atypical presentations include non-cardiac chest pain, chronic cough, hoarseness from laryngeal irritation, asthma exacerbation, and dental erosions. Alarm symptoms warranting prompt endoscopic evaluation include dysphagia, odynophagia, weight loss, gastrointestinal bleeding, and anemia, as these may indicate complications such as stricture, ulceration, or malignancy.

Diagnosis of GERD may be clinical for patients with typical symptoms responding to empiric therapy, but objective testing is important for refractory cases and preoperative evaluation. Upper endoscopy visualizes mucosal injury including erosions, ulcers, stricture, and Barrett's esophagus, though a normal endoscopy does not exclude GERD. Ambulatory pH monitoring quantifies esophageal acid exposure over 24 to 48 hours and correlates symptoms with reflux episodes, serving as the gold standard for diagnosing pathologic reflux. Esophageal manometry assesses LES pressure and esophageal body peristalsis, which is essential before antireflux surgery to exclude severe dysmotility. Barium swallow provides anatomic information about hiatal hernia, stricture, and esophageal length.

Medical management of GERD follows a stepwise approach beginning with lifestyle modifications. Patients should be counseled regarding weight loss, elevation of the head of the bed, avoiding late evening meals, and reducing dietary triggers including fatty foods, caffeine, alcohol, and chocolate. Pharmacologic therapy begins with antacids or H2 receptor antagonists for mild intermittent symptoms. Proton pump inhibitors are the mainstay of treatment for moderate to severe GERD, providing superior acid suppression and healing of erosive esophagitis, typically administered once daily 30 to 60 minutes before breakfast for 8 weeks initially. Patients with persistent symptoms on twice-daily PPI therapy or those who prefer to discontinue medications may be candidates for surgical intervention.

<image>Panel A: Pathophysiology diagram showing mechanisms of GERD including transient LES relaxations, hypotensive sphincter, hiatal hernia, and impaired clearance. Panel B: Endoscopic images comparing normal esophageal mucosa with erosive esophagitis grades A through D. Panel C: Ambulatory pH monitoring tracing showing reflux episodes and correlation with patient-reported symptoms. Panel D: Algorithm for GERD diagnosis and management from empiric therapy through objective testing to surgical consideration.</image>

IV. Hiatal Hernia

Hiatal hernia occurs when abdominal contents, most commonly the stomach, herniate through the esophageal hiatus of the diaphragm into the thoracic cavity. Type I, or sliding hiatal hernia, accounts for approximately 95 percent of cases and involves axial displacement of the gastroesophageal junction above the diaphragm, disrupting the extrinsic sphincter mechanism and predisposing to reflux. Type II, or true paraesophageal hernia, is uncommon and involves herniation of the gastric fundus alongside a normally positioned GE junction. Type III, or mixed hernia, combines elements of both with the GE junction and fundus both displaced above the diaphragm. Type IV involves herniation of other abdominal organs such as colon, spleen, or omentum along with stomach.

The clinical presentation of hiatal hernia varies by type and size. Type I hernias typically manifest with GERD symptoms, as the primary consequence is impairment of the anti-reflux barrier. Paraesophageal hernias (types II through IV) may cause dysphagia from mechanical obstruction, postprandial fullness or chest pain, and respiratory symptoms from pulmonary compression. Cameron ulcers develop at the diaphragmatic hiatus in large hernias, causing chronic occult blood loss and iron deficiency anemia. Life-threatening complications of paraesophageal hernia include incarceration, strangulation with gastric necrosis, and gastric volvulus, which may present acutely with chest pain, dysphagia, and inability to vomit.

Indications for surgical repair of hiatal hernia depend on the hernia type and associated symptoms. Type I hernias are repaired only when antireflux surgery is performed for medically refractory GERD, as the hernia itself is asymptomatic. Symptomatic paraesophageal hernias (types II through IV) should be repaired to relieve symptoms and prevent catastrophic complications. The management of asymptomatic paraesophageal hernias is debated, with guidelines recommending repair for good surgical candidates given the risk of acute incarceration. Acute incarceration or strangulation requires emergent surgical intervention.

Surgical repair of hiatal hernia involves several key components performed laparoscopically when possible. Complete reduction of the hernia sac and herniated contents into the abdomen is essential, with excision of the peritoneal sac recommended. The esophagus is mobilized to obtain adequate intra-abdominal length, with 2 to 3 centimeters of tension-free esophagus below the diaphragm. The crural defect is repaired primarily with interrupted non-absorbable sutures; mesh reinforcement may reduce recurrence but carries risk of mesh erosion. An antireflux procedure, typically Nissen or Toupet fundoplication, is added when GERD is present or when extensive esophageal mobilization disrupts the intrinsic sphincter mechanism. Gastropexy, suturing the stomach to the abdominal wall, may help prevent recurrent herniation.

<image>Panel A: Anatomic diagrams comparing Type I sliding hernia with GE junction displacement versus Type II paraesophageal hernia with fundus herniation alongside normal GE junction. Panel B: Barium swallow images demonstrating Type III mixed hernia and Type IV hernia with colon involvement. Panel C: Intraoperative laparoscopic view showing large paraesophageal hernia contents and hernia sac. Panel D: Steps of laparoscopic repair including sac excision, crural repair, and fundoplication.</image>

V. Anti-Reflux Surgery

Surgical intervention for GERD is indicated when medical management fails, when patients prefer not to take lifelong medication, or when complications arise despite treatment. Appropriate candidates have objective evidence of pathologic reflux documented by pH monitoring, symptom improvement with PPI therapy demonstrating that reflux is the cause of symptoms, and adequate esophageal body motility to propel a food bolus past a competent reconstructed valve. Patients with volume regurgitation may benefit from surgery even when PPI therapy controls heartburn, as PPIs reduce acid but do not prevent reflux of bile and other gastric contents.

Preoperative evaluation is essential to confirm the diagnosis, assess esophageal function, and exclude conditions that contraindicate fundoplication. Upper endoscopy confirms the presence of reflux esophagitis, evaluates for Barrett's esophagus, and excludes other pathology such as malignancy. Ambulatory pH monitoring documents abnormal acid exposure and symptom correlation, particularly important in patients without endoscopic evidence of esophagitis. Esophageal manometry evaluates LES pressure and peristaltic function; patients with severe hypomotility may benefit from a partial rather than complete wrap to reduce the risk of postoperative dysphagia. Barium swallow assesses anatomy, hiatal hernia, esophageal length, and stricture.

Fundoplication procedures augment the lower esophageal sphincter by wrapping the gastric fundus around the distal esophagus, increasing basal LES pressure and reducing transient relaxations. The Nissen fundoplication is a 360-degree complete posterior wrap that is the standard for patients with normal esophageal motility, providing the most durable reflux control. The Toupet fundoplication is a 270-degree posterior partial wrap preferred for patients with impaired esophageal motility, as it provides adequate reflux control with lower risk of dysphagia. The Dor fundoplication is a 180-degree anterior partial wrap used primarily following Heller myotomy for achalasia rather than for primary GERD.

Outcomes of laparoscopic fundoplication demonstrate excellent symptom relief in approximately 90 percent of appropriately selected patients at 5 years. Common early complications include dysphagia, which occurs in 10 to 15 percent but typically resolves within 3 months as postoperative swelling subsides and the wrap settles. Gas-bloat syndrome results from inability to belch following fundoplication and manifests as abdominal distension and discomfort. Recurrent reflux occurs in 5 to 10 percent over long-term follow-up and may result from wrap disruption, slipped wrap (intrathoracic migration), or wrap herniation. Reoperation rates range from 3 to 10 percent and should be performed by experienced surgeons given higher complication rates with redo surgery.

<image>Panel A: Surgical indication algorithm showing patient selection criteria including failed medical management, patient preference, and complications. Panel B: Preoperative workup flowchart integrating endoscopy, pH monitoring, manometry, and barium swallow findings. Panel C: Comparison of fundoplication techniques showing Nissen 360-degree complete wrap versus Toupet 270-degree partial posterior wrap versus Dor 180-degree anterior wrap. Panel D: Intraoperative laparoscopic image of completed Nissen fundoplication with visible short gastric vessel division and crural closure.</image>

VI. Barrett's Esophagus

Barrett's esophagus is defined as the replacement of the normal stratified squamous epithelium of the distal esophagus with metaplastic columnar epithelium containing goblet cells, a finding known as intestinal metaplasia. This adaptive change develops as a consequence of chronic gastroesophageal reflux, with prevalence of 10 to 15 percent among patients with chronic GERD symptoms. The clinical significance of Barrett's esophagus lies in its role as a premalignant condition, conferring an increased risk of esophageal adenocarcinoma estimated at 0.5 percent per year for non-dysplastic Barrett's, though the absolute risk for individual patients remains relatively low.

Endoscopic diagnosis of Barrett's esophagus requires both visual identification and histologic confirmation. Endoscopically, Barrett's appears as salmon-colored mucosa extending above the gastroesophageal junction, contrasting with the pale pink squamous epithelium of the normal esophagus. The Prague C and M criteria standardize reporting by describing the circumferential extent (C) and maximum extent (M) of the Barrett's segment in centimeters. Short-segment Barrett's is defined as less than 3 centimeters of involvement, while long-segment Barrett's involves 3 centimeters or more, with longer segments carrying higher malignancy risk. Histologic confirmation requires identification of intestinal metaplasia with goblet cells, as columnar epithelium without goblet cells does not meet the diagnostic criteria.

The progression from Barrett's esophagus to adenocarcinoma follows a metaplasia-dysplasia-carcinoma sequence, with dysplasia grade determining management strategy. Non-dysplastic Barrett's carries approximately 0.5 percent annual cancer risk and is managed with acid suppression and surveillance endoscopy every 3 to 5 years. Low-grade dysplasia has approximately 1 percent annual risk and requires more intensive surveillance at 6 to 12 month intervals, with endoscopic eradication therapy increasingly recommended. High-grade dysplasia carries 5 to 10 percent annual cancer risk and represents carcinoma in situ, requiring endoscopic eradication or surgical resection. Intramucosal carcinoma (T1a) has low risk of lymph node metastases and may be treated endoscopically, while submucosal invasion (T1b) has higher nodal risk and typically requires esophagectomy.

Endoscopic eradication therapy has become the standard treatment for dysplastic Barrett's esophagus and early mucosal cancer. Radiofrequency ablation uses thermal energy delivered via a catheter to ablate the Barrett's epithelium, which is then replaced by neosquamous epithelium. Endoscopic mucosal resection removes visible lesions en bloc or piecemeal for staging and may be therapeutic for superficial cancers. Cryotherapy applies extreme cold to destroy Barrett's tissue. These techniques, typically used in combination, achieve complete eradication of dysplasia in over 90 percent of patients with high-grade dysplasia while avoiding the morbidity of esophagectomy. Ongoing surveillance is required after successful ablation due to the risk of recurrence, particularly in the subsquamous space.

<image>Panel A: Endoscopic appearance of Barrett's esophagus showing salmon-colored columnar mucosa extending above the gastroesophageal junction with Prague C and M measurement landmarks. Panel B: Histologic progression from normal squamous epithelium through intestinal metaplasia with goblet cells to low-grade and high-grade dysplasia. Panel C: Cancer risk by dysplasia grade showing annual progression rates and recommended management. Panel D: Endoscopic eradication therapy showing radiofrequency ablation catheter positioning and post-ablation appearance.</image>

VII. Esophageal Cancer

Esophageal cancer encompasses two main histologic types with distinct epidemiology, risk factors, and anatomic distribution. Squamous cell carcinoma was historically the predominant type worldwide and remains so in endemic regions including Asia and Eastern Africa, associated with tobacco use, alcohol consumption, caustic injury, and achalasia. Adenocarcinoma has dramatically increased in incidence in Western countries over the past four decades and now accounts for the majority of cases in North America and Europe, arising primarily from Barrett's esophagus with risk factors including chronic GERD, obesity, and male sex. The overall prognosis remains poor, with 5-year survival of approximately 20 percent across all stages, reflecting the frequency of advanced disease at presentation.

Clinical presentation of esophageal cancer is often insidious, with symptoms typically appearing only after significant luminal narrowing or advanced disease. Progressive dysphagia is the most common presenting symptom, initially to solids and later to liquids, indicating that the tumor has already obstructed more than 60 percent of the lumen. Unintentional weight loss is common and is an adverse prognostic factor. Odynophagia suggests mucosal ulceration, while chest or back pain indicates potential mediastinal invasion. Hoarseness results from recurrent laryngeal nerve involvement, and aspiration may indicate tracheoesophageal fistula formation or severe obstruction with overflow regurgitation.

Staging evaluation aims to define local tumor extent, regional nodal involvement, and presence of distant metastases to guide treatment selection. Upper endoscopy with biopsy establishes the diagnosis and allows visual assessment of tumor extent. CT of the chest and abdomen evaluates for metastatic disease in the lungs, liver, and lymph nodes. PET-CT provides functional metabolic imaging to detect occult metastases and involved lymph nodes, with SUV uptake guiding biopsy of suspicious lesions. Endoscopic ultrasound provides the most accurate assessment of T stage (depth of invasion) and regional N stage, particularly for early tumors where endoscopic therapy may be an option. Bronchoscopy is performed for tumors at or above the carina to evaluate airway involvement.

The TNM staging system stratifies tumors by depth of invasion, nodal status, and presence of metastases. T1 tumors are confined to the mucosa (T1a) or submucosa (T1b), T2 tumors invade the muscularis propria, T3 tumors extend through the muscularis into the adventitia, and T4 tumors invade adjacent structures including the aorta, trachea, or vertebral bodies. Nodal staging is based on the number of involved regional lymph nodes, with N0 indicating no nodal metastases, N1 indicating 1 to 2 positive nodes, N2 indicating 3 to 6 positive nodes, and N3 indicating 7 or more positive nodes. The combination of T, N, and M status determines overall stage, which correlates with prognosis and guides multimodality treatment planning.

<image>Panel A: Anatomic distribution comparing squamous cell carcinoma (predominantly upper and mid esophagus) versus adenocarcinoma (predominantly distal esophagus and GE junction). Panel B: Endoscopic appearance of circumferential esophageal cancer causing luminal obstruction. Panel C: CT and PET imaging demonstrating esophageal mass with FDG-avid mediastinal lymph nodes. Panel D: Endoscopic ultrasound image showing tumor invasion depth and adjacent lymph nodes.</image>

VIII. Esophageal Cancer Treatment

Treatment selection for esophageal cancer depends on stage, tumor location, patient performance status, and institutional expertise, with multimodality therapy improving outcomes compared to single-modality treatment. Superficial tumors confined to the mucosa (T1a) without high-risk features such as lymphovascular invasion or poor differentiation may be treated with endoscopic mucosal resection, achieving excellent local control while avoiding the morbidity of esophagectomy. T1b tumors (submucosal invasion) and early T2 tumors without nodal involvement may be treated with esophagectomy alone at experienced centers. More advanced localized disease (T3 or node-positive) benefits from neoadjuvant therapy before surgical resection.

Neoadjuvant chemoradiation has become the standard approach for locally advanced resectable esophageal cancer based on the landmark CROSS trial. This randomized study demonstrated that preoperative weekly carboplatin and paclitaxel with concurrent 41.4 Gy radiation followed by surgery significantly improved median survival compared to surgery alone (49 versus 24 months). Pathologic complete response, defined as no residual cancer in the surgical specimen, occurs in 20 to 30 percent of patients and is associated with excellent long-term outcomes. Restaging after neoadjuvant therapy with CT and PET assesses treatment response, identifies patients who have progressed during treatment (poor surgical candidates), and informs surgical planning.

Esophagectomy removes the tumor-bearing segment of esophagus along with regional lymph nodes and reconstructs alimentary continuity using a conduit, most commonly a gastric tube. The Ivor Lewis approach combines laparotomy for gastric mobilization with right thoracotomy for esophageal resection and intrathoracic anastomosis, providing excellent exposure for mid and lower esophageal tumors. The McKeown three-field approach adds a cervical incision for anastomosis in the neck, allowing resection of proximal tumors and potentially reducing consequences of anastomotic leak. The transhiatal approach avoids thoracotomy by mobilizing the esophagus bluntly through the mediastinum from abdominal and cervical incisions, with cervical anastomosis. Minimally invasive techniques using thoracoscopy and laparoscopy are increasingly employed and have demonstrated equivalent oncologic outcomes with reduced pulmonary complications.

Complications of esophagectomy are common, reflecting the magnitude of the operation and the often compromised nutritional status of patients. Anastomotic leak occurs in 10 to 15 percent of cases and may manifest as contained leak managed with drainage or devastating mediastinitis requiring aggressive intervention. Respiratory complications including pneumonia, atelectasis, and respiratory failure occur in 15 to 20 percent and are the leading cause of postoperative mortality. Recurrent laryngeal nerve injury causing vocal cord paralysis occurs in 5 to 10 percent, particularly with cervical anastomosis. Chyle leak from thoracic duct injury occurs in 2 to 5 percent and typically responds to conservative management with dietary modification. Long-term sequelae include reflux, dumping syndrome, stricture formation, and nutritional deficiencies requiring ongoing management.

<image>Panel A: Treatment algorithm by stage showing endoscopic therapy for T1a, esophagectomy for early disease, neoadjuvant chemoradiation plus surgery for locally advanced, and palliative approaches for metastatic disease. Panel B: Comparison of esophagectomy approaches including Ivor Lewis (two-field), McKeown (three-field), and transhiatal with respective incision sites and anastomosis locations. Panel C: Surgical specimen showing esophagus with tumor and gastric conduit before anastomosis. Panel D: Postoperative anatomy following esophagectomy with gastric pull-up reconstruction.</image>

IX. Esophageal Motility Disorders

Achalasia is a primary esophageal motility disorder characterized by failure of lower esophageal sphincter relaxation and absence of peristalsis in the esophageal body, resulting from degeneration of inhibitory neurons in the myenteric plexus. Patients typically present with progressive dysphagia to both solids and liquids (distinguishing it from mechanical obstruction), regurgitation of undigested food, chest pain, and weight loss. Barium swallow reveals the classic "bird's beak" appearance of smooth tapering at the gastroesophageal junction with proximal esophageal dilation. High-resolution manometry is the gold standard for diagnosis, demonstrating incomplete LES relaxation with an elevated integrated relaxation pressure and aperistalsis of the esophageal body, with subtyping (I through III) based on contraction patterns guiding treatment selection.

Treatment of achalasia aims to reduce LES pressure to allow gravity-assisted esophageal emptying, as there is no therapy that restores normal peristalsis. Pneumatic dilation uses a balloon positioned across the LES and inflated to mechanically disrupt the sphincter muscle fibers, achieving symptom relief in 70 to 80 percent but with 2 to 5 percent perforation risk and need for repeat dilation in many patients. Laparoscopic Heller myotomy involves surgical division of the LES muscle fibers and is the gold standard surgical treatment, typically combined with partial fundoplication (Dor anterior wrap) to prevent postoperative reflux. Peroral endoscopic myotomy (POEM) is a newer endoscopic approach that creates a submucosal tunnel to access and divide the LES muscle fibers, showing similar efficacy to surgical myotomy in short-term studies but with higher rates of post-procedure reflux.

Other esophageal motility disorders are diagnosed by high-resolution manometry based on characteristic patterns. Diffuse esophageal spasm features intermittent dysphagia and chest pain with normal LES relaxation but simultaneous contractions in at least 20 percent of swallows, classically producing a "corkscrew" appearance on barium swallow. Jackhammer esophagus (hypercontractile esophagus) is characterized by extremely high amplitude contractions exceeding 8000 mmHg-sec-cm that may cause dysphagia and chest pain. Ineffective esophageal motility involves weak or failed peristalsis, often seen in systemic sclerosis (scleroderma), which causes patulous LES and aperistalsis leading to severe reflux and stricture formation. These disorders are generally managed medically with smooth muscle relaxants, though severe cases may benefit from POEM or myotomy.

Zenker's diverticulum is a false (pulsion) diverticulum occurring in the posterior hypopharynx at Killian's triangle, the area of weakness between the inferior pharyngeal constrictor and the cricopharyngeus muscle. The diverticulum forms due to relative outflow obstruction from a poorly relaxing or hypertensive cricopharyngeus combined with pharyngeal propulsive pressure during swallowing. Patients present with dysphagia, regurgitation of undigested food (often hours after eating), halitosis, aspiration, and a gurgling noise in the neck with swallowing. Treatment requires addressing both the diverticulum and the underlying cricopharyngeal dysfunction, traditionally via open cricopharyngeal myotomy with diverticulectomy or diverticulopexy, though endoscopic stapled diverticulotomy dividing the common wall between the diverticulum and esophagus has become increasingly popular for appropriately sized diverticula.

<image>Panel A: Barium swallow showing classic bird's beak appearance of achalasia with dilated esophagus and smooth distal tapering. Panel B: High-resolution manometry tracings comparing normal swallowing (sequential contractions with LES relaxation) versus achalasia (aperistalsis with incomplete LES relaxation). Panel C: Surgical techniques for achalasia showing laparoscopic Heller myotomy with anterior Dor fundoplication and POEM submucosal tunnel approach. Panel D: Lateral view of Zenker's diverticulum showing posterior pharyngeal outpouching at Killian's triangle above the cricopharyngeus muscle.</image>

X. Esophageal Emergencies

Esophageal perforation is a surgical emergency requiring prompt recognition and treatment to prevent fatal mediastinitis and sepsis. Iatrogenic perforation during endoscopy or dilation accounts for approximately 60 percent of cases, with the cervical esophagus at the cricopharyngeus being the most common site. Spontaneous perforation (Boerhaave syndrome) accounts for 15 percent and typically involves the left posterolateral distal esophagus due to the anatomic weakness at this location. Other causes include foreign body ingestion (especially sharp objects or button batteries in children), external trauma, and intraoperative injury. The mortality rate increases dramatically with delayed diagnosis, from 10 to 20 percent when recognized within 24 hours to over 50 percent when diagnosis is delayed.

Boerhaave syndrome deserves specific attention as the spontaneous form of esophageal perforation occurring during forceful vomiting that generates pressures exceeding 200 mmHg against a closed cricopharyngeus. The classic clinical presentation is Mackler's triad of vomiting, lower thoracic pain, and subcutaneous emphysema, though all three components are present in only about 30 percent of cases. Physical examination may reveal subcutaneous crepitus in the neck or chest wall, decreased breath sounds from pleural effusion, and signs of sepsis with progression. Chest radiograph may show pneumomediastinum, subcutaneous emphysema, pleural effusion, or hydropneumothorax. Diagnosis is confirmed by CT with oral water-soluble contrast or esophagography, which demonstrates extravasation at the perforation site.

Management of esophageal perforation depends on the location, size, containment of the leak, degree of contamination, and time since perforation. Small contained cervical perforations may be managed non-operatively with nothing by mouth, intravenous antibiotics, and close observation, as cervical infections drain spontaneously into the mediastinum. Thoracic perforations require more aggressive intervention given the risk of mediastinitis. Early (less than 24 hours) contained perforations in stable patients may be managed with endoscopic stenting along with drainage of any associated collections. Primary surgical repair with reinforcement (intercostal muscle or pleural flap) and wide drainage is preferred for larger defects or when stenting is not feasible. Delayed or extensively contaminated perforations may require esophageal diversion, exclusion, or resection.

Caustic ingestion causes esophageal injury ranging from superficial burns to transmural necrosis depending on the agent, concentration, and contact time. Alkaline substances (drain cleaners, lye) cause liquefactive necrosis and penetrate deeply, while acidic substances cause coagulation necrosis that may limit penetration. Immediate management focuses on airway protection (early intubation for stridor or airway concerns), avoiding emesis induction which causes re-exposure, and withholding oral intake. Endoscopy within 24 hours grades the injury: Grade I involves superficial edema, Grade II shows mucosal ulceration and sloughing, and Grade III demonstrates transmural necrosis appearing as black discoloration. Grade III injuries have high perforation risk and may require emergent esophagectomy. Long-term complications include stricture formation (requiring dilation and possible reconstruction) and significantly elevated esophageal cancer risk, necessitating surveillance.

<image>Panel A: Chest CT demonstrating pneumomediastinum and bilateral pleural effusions following esophageal perforation with arrow indicating site of extraluminal air. Panel B: Esophagogram showing contrast extravasation from distal esophageal perforation in Boerhaave syndrome. Panel C: Management algorithm for esophageal perforation based on timing, containment, and clinical stability. Panel D: Endoscopic grading of caustic injury showing Grade I superficial injury through Grade III transmural necrosis.</image>

Summary

• Esophagus: 3 segments (cervical, thoracic, abdominal), no serosa; narrowings at cricopharyngeus, aortic arch, and diaphragm
• GERD: caused by LES dysfunction, transient relaxations, hiatal hernia; diagnose with pH monitoring; treat with PPI or surgery
• Hiatal hernia: Type I (sliding) most common; paraesophageal hernias (II-IV) may require surgical repair to prevent complications
• Fundoplication: Nissen (360 degrees) for normal motility; Toupet (270 degrees) for impaired motility
• Barrett's esophagus: intestinal metaplasia from chronic GERD; surveillance and endoscopic ablation for dysplasia
• Esophageal cancer: adenocarcinoma increasing; neoadjuvant chemoradiation for T3/N+ followed by esophagectomy
• Esophagectomy: Ivor Lewis, McKeown, transhiatal approaches; 10-15% anastomotic leak rate
• Achalasia: failed LES relaxation with aperistalsis; treat with pneumatic dilation, Heller myotomy, or POEM
• Esophageal perforation: surgical emergency; early diagnosis critical; Boerhaave syndrome involves spontaneous rupture
• Caustic ingestion: endoscopy to grade injury; Grade III has high perforation risk; long-term cancer surveillance required

Key Terms

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